So why exactly do we say "in" the car but "on" the plane? For the ESL learner, as well as the curious and uncertain native English speaker, this books simplifies a great deal of that part of speech which trips many of us up. If you "HAVE TO KNOW" the rules as to why something is used a certain way, this book does that too. If all you want to know is which preposition is correct without the history of the English language tagging along, this book scores here also. It offers sixty some-odd prepositions, arranged alphabetically, with simplified models and words grouped together that suit that preposition. The book can easily be incorporated directly into a lesson plan or modeled for students self directed use. Moderately priced, I opted for a class set just to have on hand when we start fine tuning our paragraph work.